Ive read the same thing, but then I hear another report stating the complete opposite. If it does come, you are going to be waiting awhile I have a feeling.
I really wouldn't hold your breath. There is a fair chance there will be a BG3 - but it will be in name only. The BG series as we know it has effectively finished. It won't be in the infinity engine obviously. I suspect it will be something along the lines of an extended campaign around the Sword Coast, possibly using an engine very similar to NWN2